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A fork of the Signal Messenger known as Sessions has omitted several important security properties found in the original source code, making it a less secure alternative, a researcher says. The deficiencies include:

-- no forward secrecy

• insufficient Entropy in Ed25519 Keys
• no in-Band Negotiation for Message Signatures
• using Public Keys as AES-GCM Keys

Stay away from this offering unless you really, really, really know what you're doing:

https://soatok.blog/2025/01/14/dont-use-session-signal-fork/